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47 lines
2.5 KiB
Swift
47 lines
2.5 KiB
Swift
// RUN: %target-parse-verify-swift
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// XFAIL: linux
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import Foundation
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// Common pitfall: trying to subscript a string with integers.
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func testIntSubscripting(s: String, i: Int) {
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_ = s[i] // expected-error{{'subscript' is unavailable: cannot subscript String with an Int}}
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_ = s[17] // expected-error{{'subscript' is unavailable: cannot subscript String with an Int}}
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_ = s[i...i] // expected-error{{subscript' is unavailable: cannot subscript String with a range of Int}}
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_ = s[17..<20] // expected-error{{subscript' is unavailable: cannot subscript String with a range of Int}}
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_ = s[17...20] // expected-error{{subscript' is unavailable: cannot subscript String with a range of Int}}
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}
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func testNonAmbiguousStringComparisons() {
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let s1 = "a"
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let s2 = "b"
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var x = false // expected-warning {{variable 'x' was written to, but never read}}
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x = s1 > s2
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x = s1 as String > s2
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}
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func testAmbiguousStringComparisons(s: String) {
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let nsString = s as NSString
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let a1 = s == nsString
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let a2 = s != nsString
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let a3 = s < nsString // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}}
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let a4 = s <= nsString // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}}
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let a5 = s >= nsString // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}}
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let a6 = s > nsString // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}}
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// now the other way
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let a7 = nsString == s
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let a8 = nsString != s
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let a9 = nsString < s // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}}
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let a10 = nsString <= s // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}}
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let a11 = nsString >= s // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}}
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let a12 = nsString > s // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}}
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}
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func acceptsSequence<S : SequenceType>(sequence: S) {}
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func testStringIsNotASequence(s: String) {
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acceptsSequence(s) // expected-error {{cannot invoke 'acceptsSequence' with an argument list of type '(String)'}} expected-note {{expected an argument list of type '(S)'}}
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}
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